Now other scientistsÂ haveÂ substantiatedÂ a proposal that micro RNA in playing a role in sperm. See this story (“Sperm RNAs transmit stress”) from Kate Yandell in The ScientistÂ or this one from Rachel Zamzow at Spectrum, the Simons Foundation’s autism news site, for more. An added wrinkle is that thisÂ research showsÂ that descendantsÂ of stress-exposed mice show a muted response to stress.